CVE-2026-88358
simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.
- Published Sep 24, 2026
- CVSS 6.5 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available